package org.apache.maven.model.profile.activation;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.model.Activation;
import org.apache.maven.model.ActivationProperty;
import org.apache.maven.model.Profile;
import org.apache.maven.model.building.ModelProblemCollector;
import org.apache.maven.model.building.ModelProblem.Severity;
import org.apache.maven.model.building.ModelProblem.Version;
import org.apache.maven.model.building.ModelProblemCollectorRequest;
import org.apache.maven.model.profile.ProfileActivationContext;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.util.StringUtils;

/**
 * Determines profile activation based on the existence or value of some execution property.
 * 
 * @author Benjamin Bentmann
 * @see ActivationProperty
 */
@Component(role = ProfileActivator.class,
    hint = "property")
public class PropertyProfileActivator implements ProfileActivator {

  public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
    Activation activation = profile.getActivation();

    if (activation == null) {
      return false;
    }

    ActivationProperty property = activation.getProperty();

    if (property == null) {
      return false;
    }

    String name = property.getName();
    boolean reverseName = false;

    if (name != null && name.startsWith("!")) {
      reverseName = true;
      name = name.substring(1);
    }

    if (name == null || name.length() <= 0) {
      problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
          .setMessage("The property name is required to activate the profile " + profile.getId())
          .setLocation(property.getLocation("")));
      return false;
    }

    String sysValue = context.getUserProperties().get(name);
    if (sysValue == null) {
      sysValue = context.getSystemProperties().get(name);
    }

    String propValue = property.getValue();
    if (StringUtils.isNotEmpty(propValue)) {
      boolean reverseValue = false;
      if (propValue.startsWith("!")) {
        reverseValue = true;
        propValue = propValue.substring(1);
      }

      // we have a value, so it has to match the system value...
      boolean result = propValue.equals(sysValue);

      return reverseValue ? !result : result;
    } else {
      boolean result = StringUtils.isNotEmpty(sysValue);

      return reverseName ? !result : result;
    }
  }

}
